package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.MemberFeignService;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.*;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.math.BigDecimal;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskService wareOrderTaskService;

    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    OrderFeignService orderFeignService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        /**
         *  wareId: 123,//仓库id
         *    skuId: 123//商品id
         */
        String wareId= (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)){
            wrapper.eq("ware_id",wareId);
        }
        String skuId= (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)){
            wrapper.eq("sku_id",skuId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
               wrapper
        );

        return new PageUtils(page);
    }

    @Transactional
    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1.需要判断 是否存在库存记录，无就是新增，否则就是修改操作
        List<WareSkuEntity> wareSkuEntities = this.baseMapper.selectList(
                new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(wareSkuEntities==null||wareSkuEntities.size()==0){
            WareSkuEntity SkuEntity = new WareSkuEntity();
            SkuEntity.setSkuId(skuId);
            SkuEntity.setWareId(wareId);
            SkuEntity.setStock(skuNum);
            SkuEntity.setStockLocked(0);
            //远程查询sku的名字 如果失败无需回滚
            //方法1.自己捕获 方法2：服务降级
            try {
                R info = productFeignService.info(skuId);
                if(info.getCode()==0){
                    Map<String,Object> data = (Map<String,Object>) info.get("skuInfo");
                    SkuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch (Exception e){

            }
            this.baseMapper.insert(SkuEntity);
        }else{
            this.baseMapper.addStock(skuId,wareId,skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的库存量 (我们所有仓库的库存求和-所有仓库中锁定的库存)
            Long count=baseMapper.getSkuStock(skuId);

            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);
            return vo;
        }).collect(Collectors.toList());

        return collect;
    }


    /**
     * 1、库存自动解锁。-》针对：下单成功，库存锁定成功。之后业务导致下单回滚，库存自动解锁。
     * 2、订单失败：库存直接锁定失败导致。
     *
     * 只要解锁库存的消息失败，一定要告诉服务解锁失败。
     */
    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){
        // 库存解锁
        wareSkuDao.unlockStock(skuId,wareId,num);

        // 更新库存工作单的状态
        WareOrderTaskDetailEntity entity=new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);// 变为已解锁
        wareOrderTaskDetailService.updateById(entity);
    }

    /**
     * 为某个订单锁定库存
     * @param vo
     * @return
     *
     * 库存解锁的场景：
     * 1）下单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存。
     *
     * 2）下单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。
     *    之前锁定的库存就要自动解锁
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情。
         * 追溯
         */
        WareOrderTaskEntity taskEntity=new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(taskEntity);

        // 按照下单的收货地址，找到一个就近仓库，锁定库存

        // 1.找到每个商品在哪个仓库有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            // 查询这个商品在哪里有库存
            List<Long> wareIds=wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());


        // 2.锁定库存
        for (SkuWareHasStock hasStock:collect){
            Boolean skuStocked=false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds==null||wareIds.size()==0){
                // 没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }

            // 1.如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            // 2.锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            for (Long wareId:wareIds){
                Long count=wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if (count==1){
                    // 当前商品锁定成功
                    skuStocked=true;
                    // TODO 告诉MQ库存锁定成功
                    // 保存工作单详情
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    wareOrderTaskDetailService.save(entity);

                    StockLockedTo lockedTo=new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    // 只发id不行，防止回滚以后找不到数据
                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);

                    break;
                }else {
                    // 当前仓库锁失败，重试下一个仓库

                }
            }
            if (skuStocked==false){
                // 当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }

        // 3.肯定全部都是锁定成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

        StockDetailTo detailTo = to.getDetail();
        Long detailId = detailTo.getId();
        /**
         * 解锁：
         * 1、查询数据库关于这个订单的锁定库存信息
         * 有：证明库存锁定成功了
         *    解锁：要根据订单情况
         *       1.没有这个订单。必须解锁
         *       2.有这个订单。需要根据订单状态来解锁库存
         *          订单状态： 已取消——》解锁库存
         *                   没取消——》不能解锁
         * 没有：库存锁定失败，库存回滚了。这种情况无需解锁。
         */
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        //如果说详情中有记录
        if(byId!=null){
            //解锁

            //库存工作单的id-》找寻解锁的库存
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            // 根据订单号查询订单的状态
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode()==0){
                // 订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data==null||data.getStatus()==4){
                    // 订单不存在
                    // 订单已经被取消了，才能解锁库存
                    if (byId.getLockStatus()==1){
                        // 当前库存工作单详情，状态1 已锁定但是未解锁才可以解锁
                        unLockStock(detailTo.getSkuId(), detailTo.getWareId(), detailTo.getSkuNum(),detailTo.getTaskId());
                    }
                }
            }else {
                // 消息拒绝以后重新放到队列里面，让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
        }else {
            // 无需解锁

        }
    }

    //防止订单服务卡顿，导致订单状态改不了。库存消息优先到期。导致业务发生错乱（永远不能解锁库存）
    @Transactional
    @Override
    public void unLockStock(OrderTo orderTo) {
        //订单号（根据订单号，找到工作单id，根据工作单id，查一下最新库存的解锁状态，防止重复解锁库存）
        String orderSn = orderTo.getOrderSn();
        WareOrderTaskEntity task=wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        //库存工作单的id
        Long id = task.getId();
        //按照工作单id找到所有未解锁的库存商品列表，进行解锁
        List<WareOrderTaskDetailEntity> list = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        //解锁列表
        for (WareOrderTaskDetailEntity entity : list) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }
    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}